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Police are questioning a man for allegedly pushing a man into the path of an oncoming subway car, killing him, and sources say he has made statements implicating himself. Gus Rosendale reports. (Published Tuesday, Dec. 4, 2012)

A 30-year-old former deli worker has been arrested on second-degree murder charges for allegedly pushing a subway rider off the platform and into the path of an oncoming New York City subway train after an argument.

Law enforcement sources say Naeem Davis has made statements to detectives implicating himself in the deadly push. Information about an attorney was not immediately available.

A law enforcement official told NBC 4 New York the man is suspected of pushing 58-year-old Ki-Suk Han off the platform at the 49th Street station Monday afternoon. Han was hit by a southbound Q train and died.

Witnesses told police the suspect was mumbling to himself before he and Han began arguing on the platform.

A bystander recorded part of the fight between the two men and turned the video over to police, who released it to the public Monday night, and received several tips. The man who allegedly pushed Han is heard cursing and saying, in substance, "Leave me alone... stand in line, wait for the R train and that's it."

He then pushed Han onto the tracks, police said. Han tried to climb back up onto the platform but died after getting trapped between the train and the platform's edge.

The Q train operator, Terrence Legree, told the Daily News he saw the man on the tracks and tried to pull the emergency brakes on the train, but couldn't stop it in time. Even after he heard the sound of the train hitting the man and the locomotive screeched to a halt, Legree said he jumped out of the control booth and tried to help the victim.

"If someone can be saved, you have to do what you have to do," Legree, a 21-year employee with the Metropolitan Transit Authority, told the News. But Han couldn't be saved — a tragic fact that had Legree struggling with an range of emotions and questions more than a day after the man's death.

"All kinds of emotions from 'Why is this happening?' to 'Why was that guy down there?' to 'What happened?'" Legree told the News. He was treated for shock after the incident.

Police had released several photos and video clips of the suspect wanted for allegedly pushing Han into the path of Legree's train. A law enforcement official tells NBC 4 New York that co-workers from a nearby deli where the suspect works tipped off police that their colleague might be the subway pusher after they recognized his voice from video.

Investigators then saw the man on surveillance video in the street talking to street vendors outside the subway station, and when they went back to the area Tuesday, he was there, speaking with the same vendors, sources said.

Subway pushes are unusual. Among the more high-profile was the January 1999 death of Kendra Webdale. A former mental patient admitted he shoved her to her death.

Following that, the state Legislature passed Kendra's Law, which lets mental health authorities supervise patients who live outside institutions to make sure they are taking their medications and aren't a threat to safety.